utun2/tools/chatgui/src/audio_device.h

#pragma once

#include "miniaudio.h"
#include <QElapsedTimer>
#include <atomic>
#include <functional>

/* Один владелец в GUI-потоке. Callback публикует только прогресс и уведомления;
 * close() дожидается worker перед освобождением callback и его состояния. */
class AudioDevice {
public:
    using Callback = std::function<void(const void*, void*, unsigned int)>;
    AudioDevice();
    ~AudioDevice();
    AudioDevice(const AudioDevice&) = delete;
    AudioDevice& operator=(const AudioDevice&) = delete;
    bool init(ma_context* context, ma_device_config config, const char* role, uint64_t session, Callback callback);
    bool start();
    void pause(); // GUI: завершает текущий callback, сохраняя backend stream и его физический route.
    void close();
    bool needsRecovery();
    bool retryReady() const;
    void retryLater();
    void retryNow();
    bool initialized() const { return m_device != nullptr; }
    ma_device* device() const { return m_device; }
    int64_t callbackTimeUs() const { return m_callbackTime.load(std::memory_order_relaxed); }
    bool timingMeasured() const { return m_timingMeasured.load(std::memory_order_relaxed); }
    uint64_t route() const { return m_route.load(std::memory_order_relaxed); }
    bool captureMissing() const { return m_captureMissing.load(std::memory_order_relaxed); }
private:
    static void data(ma_device* device, void* out, const void* in, ma_uint32 frames);
    static void notification(const ma_device_notification* event);
    ma_device* m_device = nullptr;
    Callback m_callback;
    const char* m_role = "audio";
    QElapsedTimer m_clock;
    std::atomic<uint64_t> m_frames{0};
    std::atomic<int64_t> m_callbackTime{0};
    std::atomic<bool> m_timingMeasured{false};
    std::atomic<uint64_t> m_route{0};
    std::atomic<bool> m_captureMissing{false};
    uint64_t m_reportedRoute = 0;
    int m_reportedTiming = -1;
    std::atomic<bool> m_suspended{false};
    uint64_t m_seenFrames = 0;
    qint64 m_progressAt = 0, m_retryAt = 0;
    int m_retryDelay = 250;
};